Radial drilling-machine



- w. 1. SEARS. RADIAL DRILLING MACHINE.

APPLICATION FILED OCT. I I918. 1,865,009. Patented Jan. 11,1921.

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Patented Jan. 11, 1921.

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APPLICATION FILED OCT. 1, I9I8.

Patented Jan. 11, 1921.

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. UNITED STATES PATENT OFFICE.

WILLARD. 1!. SEARS, OF BROOKLYN, NEW YORK, ASSIGNOR '10 NILES-BEMENT-POND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

RADIAL DRILLING-MACHINE.

' Application filed October 1,

and useful Improvementsin Radial Drilling-Machlnes, of which the following is a specification.

One object of the invention is to provlde an improved unit system of construction for radial drilling machines whereby certain new and important advantages are secured. In accordance With my invention I am' able to provide either a full universal or a sem1- universal, radial drill and I am able to provide either a variable-speed-motor driving mechanism or a'constant-speed-motor driving mechanismr It is possible to provlde these different forms of machines without changing the construction of the greater part of the drill mechanism, and in this way. the cost is reduced to a minimum. A further object of the invention is to provide an improved construction for the frame which supports the-arm, the motor and other parts.

In the accompanying drawings which illustrate the preferred embodiment of the invention:

Figure 1 is a side view of a full universal radial drilling machine having a variablespeed-motor drivingmechanism.

Fig. 2 is a fragmentary vert1cal sectional view of the drilling machine shown in Fig. 1.

Fig. 3 is. a fragmentary horizontal vlew, partly in section, ofthe mechanism shown in Fig. 2.

Fig. 4 is a fragmentary vertical sectional view in some respects similar to Fig; 2 but showingasemi-universal radial drilling machine with'a constant-speed motor driving mechanism.

Fig. 5 is a fragmentary plan view, partly in section, of the mechanism shown 1n Fig. 4.

Fig. 6 isa detail View taken on the llne 6'6 of Fig. 4 looking in the direction of the arrow and showing twoof the driving gears for the drilling machine.

As concerns the general arrangement of parts, a drilling machine embodying the present invention is similar to that set forth in my )a'tent for radial drills No. 1,071,590 dated ugust26th,1913. As illustrated, the

Specification of Letters Patent.

on the base part 2. Suitablebearings for its movement away from the vertical.

Patented Jan. 11, 1921. 191a. Serial No. 256,430.

machine comprises a base, referably made up of two parts 1 and 2. lllounted on the part 2 of the base is a column 3 which is preferably divided vertically into two similar parts 3 and 3 The 'column can-be moved with respect tothe base about a vertical pivotal axis and preferably the column 1s provided at 4 with a broad supporting surface which engages a companion surface the column are provided within the base part 2 and I prefer to provide a mechanism such as that set forth in my copending application for supporting and clamping mechanism for drillin machines, Serial No. 229,999 filed April 22n 1918. As illustrated, there is provided a ball-bearing 5 at or near the center of the column which assists in supporting the column, and there is provided a roller bearing 6 which serves to hold the column in position and preveri; suitable clamping mechanism is provided which is operated by a lever 7. When the column is clamped by the said clamping mechanism the supporting surface 4 engages the corresponding surface of the base part 2, thus providing a broad flat direct and rigid support for the column.

There are provided two optionally usable frame and arm mechanisms either of which may be associated with the column 3. One of these mechanisms is adapted to form a part of a full universal radial drilling machine in which the arm is adjustable about a horizontal axis and the other mechanism is adapted to form a part of a plain radial drilling machine in whichthe arm is held against movement about a horizontal axis. One of the said column and arm mechanisms is shown in Figs. 1 to 3 and the other is shown in Figs. 4 and 5.

Referring first to Figs. 1 to 3, it will be seen that a supporting frame 8 is guided for vertical movement between the two parts 100 umn parts. The other end of the frame is 110 sufliciently narrow to permit the frame to be moved endwise into position between the column parts. At the narrow end of the frame there are provided gibs 10, 10 having inclined surfaces which engage similarly inclined surfaces on the corresponding edges of the column parts. Bolts 11, 11 are provided for holding the gibs 10, 10 in place and these bolts are adjusted to bring the gibs into working relation with the corresponding surfaces of the column parts without, however, effecting such a clamping action as would interfere with the free Vertical movement of the frame.

Formed at one side of the frame 8 is a vertical flange 1-2 which is provided with circular guiding surfaces adapted to be engaged by parts of the drill arm. As illustrated, these circular guiding surfaces are the walls of a circular T-slot 13 formed in the flange 12. The drill arm is illustrated at 14 and this arm is provided with an annular tongue15 adapted to enter the slot 13 and engage the guiding surfaces at the edges thereof. T-bolts 1616 extend into the T- slot 13 and serve to hold the arm in place with respect to the frame. When the bolts are loosened the arm can be turned about a horizontal axis and when the bolts are tightened the arm is clamped against such movement. Preferably for turning the arm there is provided a worm wheel 17 secured to the arm and a worm l3 meshing with the worm wheel carried by the frame 8. The worm 18 is mounted on a shaft19 having a squared end whereby the worm may be rotated to effect turning of the arm.

The second frame an'd arm mechanism, as illustrated in Figs. 4 and 5, includes a supporting frame 8 which is the same as the frame 8 except that it is not provided with a circular vertical flange 12. Thesame gibs 10 and associated parts are used for the frame 8*. The frame 8? is provided with a flange 12'" having a vertical surface adapted to be engaged by a similar surface of an arm 14. The arm 14; is similar to the arm 14 but is not provided with a circular tongue 15 or with a worm wheel .17. Instead it is provided with a flat surface adapted to engage the fiat surface of the flange 12 By means of bolts le --16 the arm 14 can be rigidly secured to the frame 8 and held against any movement about a horizontal axis.

For adjusting either of the supporting frames vertically there is provided a mechanism of the type set forth in my patent for adjusting mechanism No. 1,122,649 dated December 29th, 1914. As concerns the more specific features, I prefer a mechanism such as set forth in my copending application for a-djustin mechanism for drilling machines, Serial 0. 229,998, filed April 22nd, 1918. For effecting vertical adjustment there is provided a vertical screw 20, which is normally fixed against rotation, and a nut 21 which engages the screw and is adapted to be turned preferably by power. Secured t0 the screw 20 at its upper end is a conical member 22 having a concave conical surface Connected with the nut 21 is a bevel gear 26 which meshes with a bevel gear 27 on a horizontal shaft 28. When the shaft 28 is rotated in the manner to be presently described, the nut 21 is turned with respect to the screw 20, thus causing the supporting frame with the associated parts to move upward or downward along the column.

After the supporting frame has been adjusted to theproper elevation it can be clamped by means of bolts 29, 29 which extend across the frame and through the gibs 10, 10. Engaging these bolts 29, 29 are nuts provided with operating levers 30, 30. By means of these levers the bolts 29, 29 can be tightened to draw the gibs 10, 10 toward each other and thus force them into firm engagement with the inclined surfaces of the column parts so as to clamp the frame against movement.

Adapted to fit either of the arms 14 or 14 and to be horizontally movable along either of them is a saddle 31 carrying a drill head 32. The drill head is preferably angularly adjustable with respect to the saddle so that the spindle 33 thereof can be positioned at any angle.

Secured to whichever of the supporting frames 8 and 8 that isin use, is a housing 34. Connected with the drill head 32 is t' train of elements for transmitting power to rotate the spindle. This train is adapted to be associated with either one of the frame and arm mechanisms and it includes a horizontal shaft 35 extending longitudinally of the arm. This shaft is so located that, when the frame and arm mechanism shown in Figs. 1 to 3 is used, its axis is coincident with the axis of movement of the arm 14. Suitable devices, such as are well known in the art, connect the shaft 35 with the spindle 33 and with other partsof the drill head 32.

The power transmitting train preferably also includes suitable gearing located in the housing 34. As illustrated, there is a driving sleeve 36 surroundingthe shaft 35 and rotatable with respect thereto, this sleeve adapted to mesh with a gear 42 splined on the shaft 35. When the gear 42 is in the position shown, power canbe transmitted from the driving sleeve 36 through the gears 38, 39, 41 and 42to rotate the shaft 35 at a relatively slow speed. Connected with the gear 42 is a grooved collar 43 with which is associated a forkedlever 44. By means of a hand lever 45 the lever 44 vcan be moved to shift the gear 42 out of mesh with the pinion 41. The pinion 38 and the gear 42 are providedwith clutch teeth adapted to engage each other, and when the gear 42 is moved toward the left out of mesh with the inion 41 these teeth are engaged and power is then transmitted directly from the driving sleeve 36 to rotate the shaft at a relatively high speed.

Preferably the shaft is in longitudinal alinement with the aforesaid shaft 28 and a clutch is provided at 46 whereby the two shafts may be connected to transmit powerto rotate the nut 21. The clutch 46 is adapted to be operated by a hand lever 47.

I provide two optionally usable power mechanisms, either of which may be secured to the housing 34 to engage the gear 37 and thus transmit power to the driving sleeve 36 and to the aforesaid power transmitting train which is connected with the drill head.

One of these mechanisms is shown in Figs.

1 to 3 and the other of them is shown in Figs. 4 and 5. a It will be understood that either of these mechanisms may be used in accordance with the conditions which are encountered, and itwill further be understood that 'the conditions which determine the Selection of one or the other of the frame and arm mechanisms may be quite independent of the conditions which determine the selection of one or the other of the power mechanisms. Therefore either of the power mechanisms may be used witheither of the frame and arm mechanisms. The particular relationships shown in the drawings are selected merely for urposes of illustration, and it will be on erstood that other relationships may be employed.

Referrin first to the power mechanism shown in igs. 1 to 3, it will be observed that there is a bracket 48 which is bolted directly to the housing 34. Suspended from the bracket is a motor 49 which carries a pinion 50 meshing with the aforesaid gear 37 on the driving sleeve 36. The motor 49 is of the variable-speed type, being under the control of a suitable controller which is indicated at 51, but which is not shown in detail as it of itself constitutes no part be used.

umn mounted on the base of the invention. The motor 49 is adapted to be. operated on direct current and when direct current is available the power mechanism shown in Figs. 1 to 3 will ordinarily When the drill is to be operated on alternating current, use will ordinarily be? made of the power mechanism shown lnFi'gs. 4 and 5. This mechanism comprises a bracket 48 which isdirectly bolted to the housing 34. Mounted on this bracket is a motor 49 which is of the constant-speed type and is adapted to be operated on alternating current. Carried on the bracket 48 is a suitable change-speed mechanism whichis indicated in a general way at 52, the bracket being preferably constructed in box-like form to inclose the said mechanism. This mechanism does not of itself constitute a part of the present invention, it being set forth in my co-pending application forchange-speed -mechanism, Serial No. 260,224 filed Oct. 30,

ion 50, and thus change the speed of the drill spindle 33. p

The two power mechanisms are so constructed as to have approximately the same balancing effect with respect to the arm and v head, and the general arrangement of parts is such that with either power mechanism in place the combined center of gravity of the column and all of the parts carried thereby will be at. or near the center of the column;

The constant-speed motor 49 isconsiderably lighter than the variable-speed -motor 49,.and this smaller motor weight approximately compensates for the greater weight of the bracket 48 and the change-speed mechanism 52 carried thereby. The, combined center of gravity will change some what when the saddle and head are moved along the arm, but preferably it will always remain within the outline of the broad supporting surface 4 at the bottom of the column 3. The roller bearing 6 serves to resist any tendency for the column to move away from the vertical position, but it will beobvious that the frictional resistance offered by this bearing will be at a minimum when the center of gravity is close to the column axis.

' What I claim is:

1. A system of radial .drill construction,

comprising a base, a verticall divided color movement about a vertical axis, two optionally usable frame and arm mechanisms, one mechanism consisting of a supporting frame vertically movable along the column between the parts thereof and an arm connected with the frame for movement about a horizontal axis and the other mechanism consisting of a vertically movable supporting frame similar to the first said frame and an arm rigidly secured to the frame and held against movement about a horizontal axis, a horizontally movable saddle and drill head adapted to be carried by either arm, a housing secured to the frame at the side of the column opposite the arm, an electric motor secured to the housing, and a power transmitting train adapted to connect the motor and the drill head, the said train being operative with either arm mechanism in place.

2. A system of radial drill construction, comprising a base, a vertically divided column mounted on the base for movement about a vertical axis, two optionally usable frame and arm mechanisms, one mechanism I consisting of a vertically movable supporting frame vertically movable along the column between the parts thereof and provided with circular guide surfaces at one side and an arm engaging the circular guide surfaces of the frame and connected for movement about a horizontal axis and the other mechanism consisting of a vertically movable supporting frame similar to the first said frame but without circular guide surfaces and an arm rigidly secured to the frame and held against movement about a horizontal axis, mechanism located between the column parts and cooperative with either frame for'moving it vertically, a horizontally movable saddle and drill head adapted to be carried by either arm, a housing secured to the frame at the side of the column opposite the arm, an electric motor secured to the housing, and a power transmitting train adapted to connect the motor and the drill head, the said train being operative with either arm mechanism in place.

3. A system of radial drill construction, comprising a base, a column mounted on the base for movement about a vertical axis and having a horizontal base-engaging supporting surface, a supporting frame vertically movable along the column, an arm carried by the frame at one side of the column, a drill head carried by the arm,a housing secured to the frame at the other side of the column, a power transmitting train connected with the drill head and including gearing in the housing, .and two optionally usable power mechanisms each adapted-to be detachably secured to the housing, one

mechanism consisting of a bracket and avariable-speed electric motor on the bracket adapted to connect with the said power transmitting train for transmitting ower thereto and the other mechanism consisting ,of a bracket, change-speed gearing on the bracket adapted to connect with the said power transmitting train and a constantspeed electric motor on the bracket for transmitting power through the changespeed gearing to the aforesaid power transmitting train, the two said mechanisms being so constructed and arranged that the balancing effect with respect to the arm and head will be approximately the same with either mechanism secured to the housing whereby the combined center of gravity of the column and all parts carried thereby is maintained within the outline of the aforesaid supporting surface of the column.

4. A system of radial drill construction, comprising a base, a vertically divided column mounted on the base for movement about a vertical axis and having a horizontal base-engaging supporting surface, a supporting frame vertically' movable along the column between the parts thereof, an arm carried by the frame at one side of the column, a drill head carried by the arm, a housing secured to the frame at the other side of the column, a power transmitting train connected with the drill head and including gearing in the housing and a shaft extending longitudinally of the arm and passing between the divided parts of the column, and two optionally usable power mechanisms each adapted to be detachably secured to the housing, one mechanism consisting of a bracket and a variable-speed electric motor on the bracket adapted to connect with the said power transmitting train for transmitting power thereto and the other mechanism consisting of a bracket, change-speed gearin on the bracket adapted to connect with t c said power transmitting train and aconstant-speed electric motor on the bracket for transmitting power through the change-speed gearing to the aforesaid power transmitting train, the two said mechanisms being so constructed and arranged that the balancing effect with respect to the arm and head will be approximately the same with either mechanism secured to the housing whereby the combined center of gravity of the column and all parts carried thereby is maintained within the outline of the aforesaid supporting surface of the column.

5. A system of radial drill construction, comprising a base, a column mounted on the base for movement about a vertical axis and having a horizontal base-engaging supporting surface, two optionally usable frame and arm mechanisms, one mechanism consisting of a supporting frame vertically movable along the column and an arm connected with the frame for movement about a horizontal axis and the other mechanism consisting of a vertically movable supporting frame similar to the first said frame and an arm rigidly secured to the frame and heldagainst movement about a horiiontal axis, a horizontally movable saddle and drill head adapted to be carried by either arm, a housing secured to the frame at the side of the column opposite the arm, a power transmitting train connected with the drill head and including gearing in the housing, and two optionally usable power mechanisms each adapted to be detachably secured to the housing, one mechanism consisting of a bracket and avariable-speed electric motor on the bracket adapted to connect with the said power transmitting train for transmitting power thereto and the other mechanism consisting ofa bracket, change-speed gearing on the bracket adapted to connect with the said power transmitting train and a constant-speed electric motor on the bracket for transmitting power through the changespeed gearing to the aforesaid power transmitting train, the two said mechanisms being so constructed and arranged that the balancin effect with respect to the arm and head wi be approximately the same with either mechanism secured to the housing, whereby the combined center of gravityof the column and all parts carried thereby is maintained within the outline of the aforesaid supporting surface of the column.

'6. In a radial drilling-machine, the combination of a vertically divided column, a vertically movable supporting frame positioned between the parts of the column and having a flange at one end adapted to engage the corresponding edges of the column parts, the other end of the frame being suffrciently narrow to permit the frame to be moved endwise into position between the column parts, gibs adapted to be secured to the frame at the narrow end and to engage the corresponding edges of the column, an

arm" carried by the frame at the first said end, a drill head on the arm, and a motor bracket and motor carried by the arm at the second said end.

In testimony whereof, I hereto affix my signature.

WILLARD 'r. SEARS. 

